0001132716-13-000051.txt : 20130813 0001132716-13-000051.hdr.sgml : 20130813 20130813141444 ACCESSION NUMBER: 0001132716-13-000051 CONFORMED SUBMISSION TYPE: 13F-HR/A PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20121231 FILED AS OF DATE: 20130813 DATE AS OF CHANGE: 20130813 EFFECTIVENESS DATE: 20130813 FILER: COMPANY DATA: COMPANY CONFORMED NAME: UBS OCONNOR LLC CENTRAL INDEX KEY: 0001132716 IRS NUMBER: 061569842 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR/A SEC ACT: 1934 Act SEC FILE NUMBER: 028-06327 FILM NUMBER: 131032582 BUSINESS ADDRESS: STREET 1: ONE NORTH WACKER DRIVE 32ND FLOOR CITY: CHICAGO STATE: IL ZIP: 60606 BUSINESS PHONE: 3125256000 MAIL ADDRESS: STREET 1: ONE NORTH WACKER DRIVE 32ND FLOOR CITY: CHICAGO STATE: IL ZIP: 60606 13F-HR/A 1 primary_doc.xml 13F-HR/A LIVE false false false 0001132716 XXXXXXXX 12-31-2012 12-31-2012 true 2 NEW HOLDINGS true 06-30-2013 12-31-2012 Confidential Treatment Expired UBS OCONNOR LLC

ONE NORTH WACKER DRIVE 32ND FLOOR CHICAGO IL 60606

13F HOLDINGS REPORT 028-06327 N Frank Pluchino 212-525-6053 Frank Pluchino Chicago IL 08-13-2013 0 6 100238 INFORMATION TABLE 2 ubsocq412a2infotable.xml NEXEN IN COM 65334H102 70000 44300 SH Call DFND 44300 0 0 NEXEN IN COM 65334H102 623000 395000 SH Call DFND 395000 0 0 NEXEN IN COM 65334H102 7122000 264367 SH DFND 264367 0 0 NEXEN IN COM 65334H102 63395000 2353200 SH DFND 2353200 0 0 PLAINS E COM 726505100 2932000 62458 SH DFND 62458 0 0 PLAINS E COM 726505100 26096000 555942 SH DFND 555942 0 0